Supplement companies love to claim they've created a real “game-changer.” Pre JYM doesn't play that game. It doesn't need hype or flashy marketing. With 13 hand-picked ingredients included at full doses, Pre JYM is in a league of its own.

Put simply, Pre JYM is the most effective pre-workout supplement I've ever developed. It's built on solid science, years of study, and decades of professional experience. Nothing is hidden, and there is no filler. Pre JYM is research made real. It's pure pre-workout fuel."

Hit the JYM!

Jim Stoppani, PhD Owner, JYM Supplement Science

The Power of Pre JYM

No Proprietary Blends

Look at the supplement facts panel on your favorite pre-workout product and you'll most likely see the term “proprietary blend.” Supplement companies want you to think this means they've created a special blend of ingredients that magically work together to deliver unique results. Because this blend is so amazing, they have to keep the doses of each ingredient secret so no other company steals the formula.

The truth, however, is that propriety blends serve a different purpose. They allow supplement companies to hide how little of each ingredient they've actually put in a product. This results in cheap, underdosed, ineffective supplements.

Pre JYM doesn't use proprietary blends. Take a look at its supplement facts pane and you'll see the actual doses of all 13 ingredients. I have nothing to hide. I'm proud of the amount of each and every ingredient I've included. Together, those 13 ingredients in those exact doses are the closest thing to a magical formula that you're going to find.

Proper Doses

For the reasons detailed above, many supplement companies are moving toward transparency and axing proprietary blends. That's a good thing. However, these companies are still guilty of grossly underdosing ingredients.

Take citrulline malate, for example. The research on this potent amino acid shows that you need 6 grams per dose. Most pre-workout products leave out citrulline entirely, and none of them provide anywhere close to 6 grams. Until now.

No "Abbreviated" Formulas

A handful of companies are as fed up as I am with proprietary blends and underdosed formulas, but they fall short by using “abbreviated” formulas. An abbreviated formula is one that uses proper dosing of all ingredients, but only includes a few ingredients.

Take, for example, a pre-workout formula that includes beta-alanine, creatine, caffeine, and tyrosine. There's nothing wrong with it, but it could be made a lot more effective through the addition of ingredients like citrulline malate, betaine, and BCAAs, to name just a few. Why would companies not create the most robust formula possible? Because adding more ingredients costs too much money.

Pre JYM includes 13 ingredients that work in concert to prime the body for intense workouts, making it the most complete pre-workout supplement available.* If you're looking for the most complete exercise nutrition program available on the market today, take my Post JYM Active Matrix after workout to get even greater doses of potent ingredients like Creatine HCl, Betaine, and Beta-Alanine.

No Concentrates

Many companies also try to trick buyers by calling their pre-workout product “concentrated.” A serving of one of these “concentrated” products can contain as few as 3 to 6 grams of powder. What kind of magic did they use to cram enough creatine, beta-alanine, citrulline, arginine, caffeine, and other ingredients into that tiny dose? They didn't use any magic, which is why all of those “concentrated” formulas also include proprietary blends. That's also why the serving size of Pre JYM is more than 26 grams. It contains 13 ingredients at proper, powerful doses.

JS, Not BS

I've been studying supplement science in the lab and gym for decades. I've been delivering supplement advice to millions of people in the pages of Muscle & Fitness, FLEX, and Muscle & Fitness Hers, as well as here on Bodybuilding.com and my own website, JimStoppani.com, for over a decade.

Most importantly, I've been training since I was 11 years old. Before each of my workouts, I would draw on all of my experience and all of my education to concoct my own pre-workout supplement, combining ingredients from 13 different bottles and tubs.

That's why I developed Pre JYM. I wanted to give my friends, colleagues, all of you, and myself the ability to access, in one bottle, the best ingredients in the exact doses suggested to help build lean muscle, torch body fat, improve strength, and boost speed.*

300 milligrams of caffeine to boost alertness and drive, increase muscle strength and endurance, during workouts for greater training intensity.*

150 milligrams of AlphaSize® alpha-GPC for better drive, focus, and strength in the gym.*

50 micrograms of huperzine A to increase mental focus and establish a stronger mind-muscle connection.*

5 milligrams of BioPerine® to enhance absorption of nutrients for even better results.*

Under the Microscope

Let's take a closer look some of the ingredients and doses used to make Pre JYM such a pre-workout powerhouse.*

6 grams of Branched-Chain Amino Acids (BCAAs)

The BCAAs are three amino acids—leucine, isoleucine, and valine—that share a common structure.

Leucine is the most critical because it stimulates muscle protein synthesis (i.e., muscle growth).*

The optimal ratio of leucine to isoleucine to valine in a pre-workout product is 2:1:1, exactly the ratio in Pre JYM.

6 grams of Citrulline Malate

Citrulline malate is composed of the amino acid citrulline attached to malic acid (malate).In the body, citrulline is readily converted to arginine, and then to nitric oxide (NO). Research suggests that citrulline increases arginine and NO levels in the body better than arginine itself.* Arginine undergoes excessive breakdown by the intestines and liver. Citrulline does not, so whatever you consume is readily absorbed and put to use.*

Citrulline malate is also a proven energy booster. One study reported that subjects consuming 6 grams of citrulline malate for 15 days experienced a 35% increase in ATP (energy) production during exercise and a 20% increase in phosphocreatine recovery between bouts of exercise.*

Research also suggests that subjects supplementing with citrulline malate before a chest workout could complete at least one to two more reps on most sets compared to subjects taking a placebo.

2 grams of Creatine HCL

There are hundreds of studies suggesting that creatine supplementation leads to significant gains in muscle strength and power, as well as muscle growth.*

Creatine HCL is made by attaching a hydrochloride (HCL) group to creatine.

Adding the hydrochloride group lowers the pH of creatine, making it more acidic. This drastically increases creatine's solubility in fluids, which increases its absorption and reduces stomach issues.*

2 grams of CarnoSyn® Beta-Alanine

Beta-alanine is an amino acid that gets taken up by muscle fibers and combines with the amino acid histidine to form carnosine.*

Research suggests that carnosine increases strength and power, improves endurance and recovery, and muscle growth.* This is especially true when taken together with creatine, as in Post JYM.

One study suggested that four weeks of beta-alanine supplementation in boxers increased their average punching power in the last 10 seconds of a round by 2,000 percent more than those taking a placebo. Being able to maintain punching power late in the round is similar to maintaining more strength and power later in your workouts, meaning you can lift more weight for more reps.*

500 mg of Beta Vulgaris L. (Beet) Extract

Beet extract is a rich source of nitrates. When you consume nitrates, they are broken down first to nitrites and then to nitric oxide (NO).

This means that beet extract is a direct supplier of NO and uses a different pathway to produce NO than citrulline and arginine!*

Research suggests that nitrates improve blood flow to working muscles and the brain.* The result is greater training intensity and endurance, and better brain function and focus during workouts.*

Research has also found that nitrates can directly improve the muscle's ability to generate ATP (energy) to further improve endurance during intense exercise, such as lifting weights.*

1.5 grams of Betaine

Betaine, also known as trimethylglycine (TMG), is a modified version of the amino acid glycine.

Betaine supplementation has been suggested in clinical studies to improve muscle strength and power production, increase the number of reps done with a given weight, and improve endurance.*

University of Connecticut researchers reported that supplementing with 1.25 grams of betaine twice per day for two weeks increased bench press power by 20 percent and muscle force on the bench press by 25 percent.*

Betaine has also been shown to significantly increase protein synthesis following workouts as compared to a placebo. This can help lead to greater muscle growth in the long term.*

300mg of AlphaSize® Alpha-Glyceryl phosphoryl choline (Alpha-GPC)

Alpha-glyceryl phosphoryl choline (alpha-GPC) is a naturally occurring phospholipid compound that plays a critical role in the way the brain, nervous system, and muscles function.

Alpha-GPC boosts brain function and mood, improves reaction time, and helps increase focus and the mind-muscle connection during workouts.*

When combined with caffeine, L-tyrosine, and huperzine A (all found in Pre JYM), alpha-GPC delivers clean mental stimulation and focus that last throughout workouts with no crash.*

600mg of N-Acetyl L-Cysteine (NAC)

NAC is the amino acid cysteine with an acetyl group attached to it. The acetyl group makes it more stable and allows the body to absorb and use it better than plain cysteine.*

50mcg of Huperzine A

This extract from club moss is a potent brain booster that can promote better focus, enhanced memory, and elevated mood.*

Huperzine A helps maintain higher levels of acetylcholine, which is important for brain and muscle function.*

Combining it with alpha-GPC, which increases acetylcholine levels, has an additive effect, resulting in enhanced drive and focus in the gym, as well as increased muscle strength and endurance.*

300mg of Caffeine

Research confirms that caffeine can immediately increase muscle strength, improve muscle endurance, and decrease muscle fatigue during workouts, which allows you to take your training intensity to a higher level.*

Caffeine is also suggested to be a nitric oxide (NO) booster. One study in the American Journal of Cardiology reported that healthy young men taking 300 mg of caffeine experienced an increase in NO levels and an increase in blood flow to muscles.*

5 mg of BioPerine®

BioPerine® is a patented extract of the fruit of black pepper, or long pepper, that contain standardized amounts of the active ingredient piperine.

1.5g of Tyrosine

1,000 mg of Taurine

Taurine is a specialized amino acid that is important for endurance and muscle strength.*

Exercise depletes taurine levels, thereby impairing strength and endurance, so it's critical to get a dose of taurine after every workout to replenish what was lost.*

Ratings & Reviews

Overall Rating

9.0

4,321 Ratings

Verified Buyer Rating

9.1

3,807 Ratings

Average Flavor Rating

9.0

8 Flavors

Top Rated Flavor

8.5

Cherry Limeade

By clicking the button above, you agree to entering the Bodybuilding.com Reviews section. Products in the Store are not intended to diagnose, treat, cure, or prevent any disease.

raphaelodelius

Mar 19, 2018

9

Verified Buyer

8 Strawberry Kiwi

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mickey6184

Mar 16, 2018

8

9 Black Cherry

8 Cherry Limeade

10 Strawberry Kiwi

Finally found one I love strawberry kiwi!!

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kenpoben

Mar 15, 2018

8

Verified Buyer

4 Orange Mango

2 Strawberry Kiwi

I LOVED the Orange Mango flavor and have been using it since it was first released. I couldn't find it last month, so I ordered the Strawberry Kiwi from the 2.0 line and it was awful. The first JYM product I've ever had that wasn't good. I was excited to see Orange Mango come back, and ordered a ton of it. I threw half a tub of Strawberry Kiwi in the trash in my excitement to switch back to my preferred flavor, only to find that it had been replaced with a 2.0 version that had the same bad taste as the other one. To say the least, I am highly disappointed in the change.
To be fair, I must say that it is still a great product, and if taste isn't a big deal for you then you could hardly ask for better. I agree with most of the ingredients and the dosing and I trust Jim's products, but the change in taste is so severe that I'm going to look into other brands.

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brianpitre

Mar 12, 2018

10

Verified Buyer

8 Natural Island Punch

I started using Pre JYM when it was first released years ago and loved it - first pre-workout that seemed to actually work. I stopped after a year, because I was really trying to clean up my diet and eliminate the chemical sweeteners and color dyes.
When Natural Island Punch was introduced, I went back to Pre JYM, and it's been great. The flavor isn't the best, but I don't drink it for taste. I'll take it any day if I don't have to drink the sucralose and dyes.

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teamleader1970

Mar 09, 2018

8

Verified Buyer

8 Raspberry Lemonade

The new Raspberry Lemonade is Good but it was better with the original formula as for the flavor. When you state you are releasing the ORIGINAL LEGACY FLAVORS then release the ORIGINAL LEGACY FLAVORS! DO NOT CHANGE THEM! It would be great if you would fix this and bring back the TRUE ORIGINAL FLAVOR...

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jasonjames425

Mar 09, 2018

8

Verified Buyer

1 Raspberry Lemonade

Why would you change the flavor profile? It wasn't bad the way it was. Now it's awful. The product itself is great. But why do people change a good thing? Stop tinkering with something that was great as is. Making new flavors is fine. But leave the original ones as is.

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GodofTraps

Mar 08, 2018

10

6 Natural Island Punch

the best pre workout on the market at the moment... nice clean enery and great pumps as flavour goes its pretty mediocre.

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cspurlin44

Mar 07, 2018

1

Verified Buyer

2 Refreshing Melon

3 Black Cherry

3 Raspberry Lemonade

3 Rainbow Sherbet

I've used pre jym for years. Something over the last year has changed though. Not only with the flavors, but with the overall quality. It doesn't seem to be as potent as it use to be over a year ago and whatever they changed has also started causing me stomach issues when I take the pre jym. This product was perfect when it first came out. But over the last year, just like with any great product the company starts to use cheaper ingredients and sacrifice quality to make more money. It was only a matter of time before jym products took that turn as well. Seems like they are definitely there now.

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Brad20012

Mar 05, 2018

6

Verified Buyer

6 Raspberry Lemonade

I have been taking Raspberry Lemonade for years and I have never tasted anything better. When it was removed for whatever reason, I literally went into withdrawal and no matter what else I've tried it hasn't been as good. Finally today I received my three tubs of Raspberry Lemonade and can someone please explain to me WHY it is an entirely new flavor??? This is not the same formula and doesn't taste anything like the old flavor. I thought this was just supposed to be a labeling issue? Why would you change the taste of something that so many people craved. I can't tell you how disappointed I am in the new taste. I have spent thousands of dollars on Jym products but unless we get the old flavors back I am going to move on and find something else. Very disappointed.

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NinersEmpire49

Mar 05, 2018

10

8 Black Cherry

10 Refreshing Melon

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JayJ228

Mar 04, 2018

5

10 Natural Island Punch

I don’t know anymore. I’ve been taking this product for a couple months and besides the horrible taste of Natural Island Punch I’ve had on and off days with taking this. I take one scoop at a time and chug my bottle so the taste can leave my mouth as quickly as possible. Some days I’m at the gym smashing/meeting my PR’s while other days I can’t hit them. I’m not blaming it on the supplement because I’m only 16 so I’m still changing and there are many factors that can be behind my slumps but I want a product that can make me feel awesome and pumped regardless. Bottom line is it’s a good supplement but the taste is horrible and I’m gonna begin to look for better preworkouts.

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crush14

Mar 03, 2018

10

Verified Buyer

10 Rainbow Sherbet

The Sherbet is fantastic!

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Cdub115

Mar 02, 2018

1

Verified Buyer

1 Cherry Limeade

1 Orange Mango

Once again now that Jim took this product back and made it the new "2.0" version it just doesn't taste the same. Bodybuilding.com take a hard look at all these negative reviews on the pre/pro jym and do something about it. Please take all your original flavors back over, they were exceptional. If Jim wanted to make them part of the new "2.0" line all he had to do was put his new label on, there was no need to change the formula. I used to buy into what Jim Stoppani was selling and in the beginning I honestly think he was wanting to change the landscape in the industry but now I think he's just in it for the money. These new formulas taste cheap and they are all disgusting. I will not be purchasing JYM products again until the ORIGINAL formulas are back. I'll go back to AML pre in the meantime.

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nthakr2

Mar 02, 2018

8

Verified Buyer

9 Refreshing Melon

1 Black Cherry

1 Natural Island Punch

5 Rainbow Sherbet

6 Strawberry Kiwi

Pre-JYM used to be LIFE as a preworkout. However the newer versions are no where nearly as good. Refreshing melon is the only decent one but the others are just terrible tasting. They do the job as a preworkout and gets you working out hard for 1-1.5 hours. Just make sure you guys follow Jim’s instructions and don’t chug it after mixing it as it can cause some bad diarrhea. But still one of the best pre workout out there.

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bjslagter

Mar 02, 2018

5

Verified Buyer

5 Cherry Limeade

1 Rainbow Sherbet

The new Cherry Limeade tastes different and isn't as good as the old one. Not sure why they did that - the old stuff was far superior. This one just tastes mediocre and isn't anything special. The Rainbow Sherbet was about the worst thing I've tasted. Opening up the bottle, it smelled bad to begin with and didn't taste any better. I was hoping the "new" Cherry Limeade would be the exact same as the old, but it's clearly different. I still like the ingredient profile, but this stuff used to taste amazing. Not sure what happened here, but it's not a good development.

ALLERGEN WARNING: Produced on shared equipment that also produces products that may contain EGG, MILK, SOY, TREE NUTS, and WHEAT.

Directions For Pre JYM: Mix 1 scoop of Pre JYM in 14oz. of water and drink 30-45 minutes before workouts.

Warnings: Check with a qualified healthcare professional before taking this product. Do not use if you are sensitive to caffeine, pregnant or nursing a baby, under 18 years of age, have any known or suspected medical conditions, and/or if you are taking any prescription or OTC medications. Pre JYM is an incredibly strong pre-workout matrix that contains 300mg caffeine per serving, the equivalent of approximately 3 cups of coffee. Avoid using with any other caffeinated products. Too much caffeine may cause nervousness, irritability, sleeplessness, and, occasionally, rapid heartbeat. Always begin use with 1/2 scoop or less and assess your tolerance. Once tolerance is assessed, take a maximum dose of 1 scoop. To avoid sleeplessness, do not consume within 6 hours of bedtime. Concerning California Residents: This product contains chemicals known to the State of California to cause cancer and birth defects or reproductive harm. KEEP OUT OF REACH OF CHILDREN.

* These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.

I certify that I have used this product. I am basing my review on my personal experience and I do not work for a company which makes and/or distributes its own line of supplements.Note: Employees of Bodybuilding.com are exempt.

Your rating and review will appear on both your BodySpace profile and onreviews.bodybuilding.comwhere you also view ratings and reviews of other BodySpace members.

Always consult with a qualified healthcare professional prior to beginning any diet or exercise program or taking any dietary supplement. The content on our website is for informational and educational purposes only and is not intended as medical advice or to replace a relationship with a qualified healthcare professional.